Object sailor has to receive (6)
I believe the answer is:
target
'object' is the definition.
('target' can be a synonym of 'object')
'sailor has to receive' is the wordplay.
'sailor' becomes 'tar' (tar is a kind of sailor).
'has' says to put letters next to each other.
'to receive' becomes 'get' ('get' can be a synonym of 'receive').
'tar'+'get'='TARGET'
(Other definitions for target that I've seen before include "Aimpoint" , "aunt Sally" , "'Aim, goal (6)'" , "Reference point to shoot at" , "Butt" .)